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Altera_Forum
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17 years ago

cycloneIII configuration problems

hello recently i am testing my board with a cycloneIII device. its configuration device is epc16. i can successfully program fpga, but fpga can not work fine. although my vhdl program is a ve...
Altera_Forum's avatar
Altera_Forum
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17 years ago

this 25ohm resistor is a must have on cyclone III between the DATA output of your EPCS and the DATA[0] of the FPGA. i have seen this resistor in the altera docs about AS configuration and my FAE strongly advised me to use it. You must place this resistor as close to the data output pin of your EPC(S) as possible. but this is also mentioned in the altera docs.

the cyclone III devices need that you take care about the external signals especially if you use 3,3V IO.

with all these "must look after" in cyclone III it took me longer for the designs as for cyclone II, but now they run fine.